July 03, 2015 10:45 AM

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Josh Hartnett is getting ready for his biggest role yet — dad!

The Black Hawk Down star and his British girlfriend, actress and model Tamsin Egerton, are expecting their first child, his rep confirms to PEOPLE.

The actors are said to have met on the set of The Lovers in 2011 and have been together almost four years.

Hartnett’s rep told the New York Post‘s Page Six that the couple is “beyond thrilled.”

Hartnett, 36, currently stars on Showtime’s Penny Dreadful, and Egerton, 26, is filming Sacha Baron Cohen‘s Grimsby with Rebel Wilson and Isla Fisher.

No word yet on when the baby is due.

— Maria Coder with reporting by Julie Jordan

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